JPH095873A - Film spreading roller device for instant camera - Google Patents

Abstract

PURPOSE: To prevent the film from being deflected at the time of spreading the film even if film extending rollers are thin by elastically pressing one roller against the other roller and providing a camera body with a projection to be brought into slidable contact with the low-friction surface of the other roller. CONSTITUTION: The periphery 14a of almost the central part of one roller 14 is constituted to be an annular low-friction surface and the projection 1a with an end surface having the same width as that of the periphery 14a is integrally provided with the camera body 1. The other roller 17 is pressed against the roller 14 by a roller pressing leaf spring 30 attached to the camera 1. Moreover, the entire peripheries of a pair of the rollers 14 and 17 are formed to be a rough surface by blasting processing, etc. Thus, when a film passes through between a pair of the rollers 14 and 17, the roller 14 and/or the roller 17 is rotated by the projection 1a and the pressing spring 30, without being deflected, so that a developer is uniformly scattered to the whole of a film surface and the film can be smoothly and surely fed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instant camera equipped with a pair of rollers for feeding a photographed film in the form of a photograph while sandwiching one edge of the photographed film and diffusing a developing solution over the entire film surface. The present invention relates to a film developing roller device used in the camera.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are side views and IV of FIG. 3 showing an example of the essential structure of a conventional instant camera of this kind.
FIG. 4 is a sectional view taken along line IV, in which 1 is a camera body,
2 is a bellows device foldably attached to the front of the camera body 1, 3 is a taking lens, 4 is a shutter, 5 is a motor attached to the camera body 1, 6 is a worm fixed to the main shaft of the motor 5, 7 is a worm gear pivotally supported by the camera body 1 and meshed with the worm 6, 8 is a pinion integral with the worm gear 7, 9 is a gear pivotally supported by the camera body 1 and meshed with the pinion 8, 10 is a gear 9 An integral pinion, 11 is a gear pivotally supported by the camera body 1 and meshes with the pinion 10, 12 is a pinion integral with the gear 11, and 13 is a film development rotatably mounted between both side walls of the camera body 1. A gear fixed to one of the rollers 14 and meshing with the gear 11, 15 is a pinion integrated with the gear 13, 16 is a small predetermined distance from the one film developing roller 14 A gear fixed to the other film developing roller 17 extending parallel to the one film developing roller and rotatably extending between both side walls of the camera body 1 and meshed with the pinion 15, and 18 a developed film It is a film outlet opened in a slit shape on the side wall of the camera body 1 for discharging.

Reference numeral 19 is a gear pivotally supported by the camera body 1 and meshed with the pinion 12, 20 is a pinion integrated with the gear 19, 21 is pivotally supported by the camera body 1 and the pinion 2
A gear meshed with 0, 22 is a gear pivotally supported by the camera body 1 and meshes with the gear 21, 23 is a cam projecting on the rear surface of the gear 22, and 24 is vertically movably supported by the camera body 1. A sliding plate having bent portions 25 and 26 that can be engaged with and disengaged from the cam 23, and 27 is attached to the sliding plate 24 and scrapes only one photographed film from the film pack 28 loaded in the camera body 1. A claw piece 29 that can be raised is a spring that pulls the sliding plate 24 downward.

Since this kind of conventional instant camera is constructed as described above, the film pack 28 is loaded into the camera body 1, the protective cover is removed, and the shutter button is pressed after the preparation for photographing is completed. For example, the shutter 4 is opened and closed to expose the first film. When the exposure operation is completed, the motor 5 is subsequently rotated, and the rotation is performed by the worm 6, the gear 7, the pinion 8, the gear 9, the pinion 10,
It is transmitted to the pair of film developing rollers 14 and 17 via the gear 11, the pinion 15 and the gear 16, and is transmitted to the gear 22 via the pinion 12, the gear 19, and the pinions 20 and 21. The rotation of the gear 22 causes the cam 23 to come into contact with and push up the bent portion 25, so that the sliding plate 24
Is lifted, and the nail piece 27 is also lifted with it, and scrapes up only one photographed film. The upper edge of the photographed film thus scraped up is pushed between the pair of rotating film developing rollers 14 and 17. Thus, the film is a pair of film spreading rollers 14,1.
7 is pushed toward the film outlet 18, and the developing solution is uniformly diffused over the entire film surface for development, and is discharged from the film outlet 18 to the outside. At this time, the gear 22 completes one rotation, and the sliding plate 24 also descends with the rotation of the gear 24 due to the contracting force of the spring 29 and returns to the position shown in the figure, the rotation of the motor 5 is stopped, and one film development is performed. The process ends.

[0005]

By the way, the above-mentioned film developing rollers 14 and 17 have no problem in strength when they have a certain thickness or more, but there is a demand for downsizing, thinning and weight saving of the camera itself. If the thickness cannot be less than a certain value, the rollers will bend during the film expanding operation, and an appropriate film expanding thickness cannot be secured between the rollers.
There was a problem that uneven development occurred on the photo.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to flex the film developing roller even when the film developing roller is thin in this type of camera. It is an object of the present invention to provide a film developing roller device which is prevented from being stripped.

[0007]

In order to achieve the above object, in the film developing roller device according to the present invention,
At least one of the pair of rollers is configured to have a low friction surface on at least a substantially central portion thereof, and the other roller is elastically pressed toward the one roller to lower the one of the rollers on the camera body. Protrusions are provided that are in sliding contact with the friction peripheral surface. According to the present invention, the peripheral surface of the roller is blasted except for the portion that is in sliding contact with the protrusion, and the protrusion has a predetermined length in the axial direction of the roller. Is formed in.

[0008]

During the film unfolding operation, the film unfolding roller is restrained by the projection even if it tries to bend. The entire peripheral surface of the roller is blasted except for the ring-shaped portion that is in sliding contact with the protrusion, and most of the peripheral surface of the roller is rough, so that the film is delivered without slipping.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiment. FIG. 1 is a sectional view of a main part of a roller device according to the present invention,
FIG. 2 is a sectional view taken along the line II-II in FIG. The roller driving device and other components are the same as those described in the related art, and therefore the description thereof will be omitted, and the members substantially the same as those of the conventional device will be denoted by the same reference numerals.

In the film developing roller device according to the present invention, the peripheral surface 14a at the substantially central portion of the one roller 14 is formed as a ring-shaped low friction surface, and the peripheral surface 14a is formed on the camera body 1. The protrusion 1a having an end face having a width corresponding to the width of is integrally provided. This protrusion 1a
The number is not limited to one, and a plurality may be provided. The other roller 17 is pressed toward the roller 14 by a roller pressing plate spring 30 attached to the camera body 1. In addition, the entire circumferential surface of the pair of rollers 14 and 17 is
In order to ensure that the film can be sent out when the film is developed, it is formed to have a rough surface by blasting or the like, but only the peripheral surface 14a is subjected to blasting or the like so as to be a smooth surface. Absent.

Since the apparatus of the present invention is constructed as described above, when the film passes between the pair of rollers 14 and 17, the rollers 14 and / or 17 are bent by the projection 1a and the roller pressing spring 30. Without being rolled, the developing solution is uniformly diffused over the entire film surface, and the film can be delivered smoothly and reliably. In this case, since the roller peripheral surface 14a is configured to have a low friction surface, heat is not generated between the roller peripheral surface 14a and the sliding contact surface of the protrusion 1a. As described above, in the embodiment, the projection is provided only on the roller 14 side, but the projection may be provided on the roller 17 side as necessary.

[0012]

As described above, according to the present invention, even if the film developing roller has a relatively small diameter, the roller is not bent during the film developing, and an appropriate film developing thickness is obtained by an extremely simple modification. It is possible to provide a film developing roller device for an instant camera that can be stably obtained. Further, according to the present invention, the roller peripheral surface that should be in sliding contact with the protrusion is configured to have a low friction surface, and the entire roller peripheral surface is blasted, so that the film is always formed even after long-term use. It is possible to provide a high-performance device of this type that can be reliably sent out.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a film developing roller device according to the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a side view showing a configuration of a main part of a conventional example of an instant camera.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

[Explanation of symbols]

 1 Camera Body 1a Protrusion 2 Bellows Device 3 Photographing Lens 4 Shutter 5 Motor 6 Worm 7 Worm Gear 8, 10, 12, 12, 15, 20 Pinion 9, 11, 13, 16, 19, 19, 21, 22 Gear 14, 17 Roller 14a Low Friction Circumferential surface 18 Film outlet 23 Cam 24 Sliding plate 25, 26 Bent portion 27 Claw piece 28 Film pack 29 Spring 30 Roller holding plate spring

Claims (3)

[Claims] 1. An instant camera equipped with a pair of rollers that feeds out the photographed film while sandwiching one edge of the photographed film and diffusing a developing solution over the entire surface of the film, and at least a substantially central portion of at least one of the rollers. Is configured to have a low friction surface, the other roller is elastically pressed toward the one roller, and the camera body is provided with a protrusion that slides on the low friction peripheral surface of the one roller. Characteristic film development roller device. 2. The film developing roller device according to claim 1, wherein the peripheral surface of the roller is blasted except for a portion that is in sliding contact with the protrusion. 3. The film developing roller device according to claim 1, wherein the protrusion has a predetermined length along the axial direction of the roller.